2 * acpi.c - Architecture-Specific Low-Level ACPI Support
4 * Copyright (C) 1999 VA Linux Systems
5 * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
6 * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
7 * David Mosberger-Tang <davidm@hpl.hp.com>
8 * Copyright (C) 2000 Intel Corp.
9 * Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
10 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
11 * Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
12 * Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
13 * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
14 * Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
16 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/sched.h>
39 #include <linux/smp.h>
40 #include <linux/string.h>
41 #include <linux/types.h>
42 #include <linux/irq.h>
43 #include <linux/acpi.h>
44 #include <linux/efi.h>
45 #include <linux/mmzone.h>
46 #include <linux/nodemask.h>
48 #include <asm/iosapic.h>
49 #include <asm/machvec.h>
51 #include <asm/system.h>
54 #include <asm/cyclone.h>
56 #define BAD_MADT_ENTRY(entry, end) ( \
57 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
58 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
60 #define PREFIX "ACPI: "
62 void (*pm_idle) (void);
63 EXPORT_SYMBOL(pm_idle);
64 void (*pm_power_off) (void);
65 EXPORT_SYMBOL(pm_power_off);
67 unsigned int acpi_cpei_override;
68 unsigned int acpi_cpei_phys_cpuid;
70 unsigned long acpi_wakeup_address = 0;
72 #ifdef CONFIG_IA64_GENERIC
73 static unsigned long __init acpi_find_rsdp(void)
75 unsigned long rsdp_phys = 0;
77 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
78 rsdp_phys = efi.acpi20;
79 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
80 printk(KERN_WARNING PREFIX
81 "v1.0/r0.71 tables no longer supported\n");
87 acpi_get_sysname(void)
89 #ifdef CONFIG_IA64_GENERIC
90 unsigned long rsdp_phys;
91 struct acpi_table_rsdp *rsdp;
92 struct acpi_table_xsdt *xsdt;
93 struct acpi_table_header *hdr;
98 rsdp_phys = acpi_find_rsdp();
101 "ACPI 2.0 RSDP not found, default to \"dig\"\n");
105 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
106 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
108 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
112 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
114 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
116 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
120 if (!strcmp(hdr->oem_id, "HP")) {
122 } else if (!strcmp(hdr->oem_id, "SGI")) {
123 if (!strcmp(hdr->oem_table_id + 4, "UV"))
130 /* Look for Intel IOMMU */
131 nentries = (hdr->length - sizeof(*hdr)) /
132 sizeof(xsdt->table_offset_entry[0]);
133 for (i = 0; i < nentries; i++) {
134 hdr = __va(xsdt->table_offset_entry[i]);
135 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
136 sizeof(ACPI_SIG_DMAR) - 1) == 0)
143 # if defined (CONFIG_IA64_HP_SIM)
145 # elif defined (CONFIG_IA64_HP_ZX1)
147 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
148 return "hpzx1_swiotlb";
149 # elif defined (CONFIG_IA64_SGI_SN2)
151 # elif defined (CONFIG_IA64_SGI_UV)
153 # elif defined (CONFIG_IA64_DIG)
155 # elif defined(CONFIG_IA64_DIG_VTD)
158 # error Unknown platform. Fix acpi.c.
165 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
167 /* Array to record platform interrupt vectors for generic interrupt routing. */
168 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
169 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
172 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
175 * Interrupt routing API for device drivers. Provides interrupt vector for
176 * a generic platform event. Currently only CPEI is implemented.
178 int acpi_request_vector(u32 int_type)
182 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
183 /* corrected platform error interrupt */
184 vector = platform_intr_list[int_type];
187 "acpi_request_vector(): invalid interrupt type\n");
191 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
193 return __va(phys_addr);
196 /* --------------------------------------------------------------------------
197 Boot-time Table Parsing
198 -------------------------------------------------------------------------- */
200 static int total_cpus __initdata;
201 static int available_cpus __initdata;
202 struct acpi_table_madt *acpi_madt __initdata;
206 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
207 const unsigned long end)
209 struct acpi_madt_local_apic_override *lapic;
211 lapic = (struct acpi_madt_local_apic_override *)header;
213 if (BAD_MADT_ENTRY(lapic, end))
216 if (lapic->address) {
217 iounmap(ipi_base_addr);
218 ipi_base_addr = ioremap(lapic->address, 0);
224 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
226 struct acpi_madt_local_sapic *lsapic;
228 lsapic = (struct acpi_madt_local_sapic *)header;
230 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
232 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
234 smp_boot_data.cpu_phys_id[available_cpus] =
235 (lsapic->id << 8) | lsapic->eid;
245 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
247 struct acpi_madt_local_apic_nmi *lacpi_nmi;
249 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
251 if (BAD_MADT_ENTRY(lacpi_nmi, end))
254 /* TBD: Support lapic_nmi entries */
259 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
261 struct acpi_madt_io_sapic *iosapic;
263 iosapic = (struct acpi_madt_io_sapic *)header;
265 if (BAD_MADT_ENTRY(iosapic, end))
268 return iosapic_init(iosapic->address, iosapic->global_irq_base);
271 static unsigned int __initdata acpi_madt_rev;
274 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
275 const unsigned long end)
277 struct acpi_madt_interrupt_source *plintsrc;
280 plintsrc = (struct acpi_madt_interrupt_source *)header;
282 if (BAD_MADT_ENTRY(plintsrc, end))
286 * Get vector assignment for this interrupt, set attributes,
287 * and program the IOSAPIC routing table.
289 vector = iosapic_register_platform_intr(plintsrc->type,
290 plintsrc->global_irq,
291 plintsrc->io_sapic_vector,
294 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
295 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
296 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
297 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
298 ACPI_MADT_TRIGGER_EDGE) ?
299 IOSAPIC_EDGE : IOSAPIC_LEVEL);
301 platform_intr_list[plintsrc->type] = vector;
302 if (acpi_madt_rev > 1) {
303 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
307 * Save the physical id, so we can check when its being removed
309 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
314 #ifdef CONFIG_HOTPLUG_CPU
315 unsigned int can_cpei_retarget(void)
317 extern int cpe_vector;
318 extern unsigned int force_cpei_retarget;
321 * Only if CPEI is supported and the override flag
322 * is present, otherwise return that its re-targettable
323 * if we are in polling mode.
325 if (cpe_vector > 0) {
326 if (acpi_cpei_override || force_cpei_retarget)
334 unsigned int is_cpu_cpei_target(unsigned int cpu)
336 unsigned int logical_id;
338 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
340 if (logical_id == cpu)
346 void set_cpei_target_cpu(unsigned int cpu)
348 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
352 unsigned int get_cpei_target_cpu(void)
354 return acpi_cpei_phys_cpuid;
358 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
359 const unsigned long end)
361 struct acpi_madt_interrupt_override *p;
363 p = (struct acpi_madt_interrupt_override *)header;
365 if (BAD_MADT_ENTRY(p, end))
368 iosapic_override_isa_irq(p->source_irq, p->global_irq,
369 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
370 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
371 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
372 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
373 ACPI_MADT_TRIGGER_EDGE) ?
374 IOSAPIC_EDGE : IOSAPIC_LEVEL);
379 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
381 struct acpi_madt_nmi_source *nmi_src;
383 nmi_src = (struct acpi_madt_nmi_source *)header;
385 if (BAD_MADT_ENTRY(nmi_src, end))
388 /* TBD: Support nimsrc entries */
392 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
394 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
397 * Unfortunately ITC_DRIFT is not yet part of the
398 * official SAL spec, so the ITC_DRIFT bit is not
399 * set by the BIOS on this hardware.
401 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
407 static int __init acpi_parse_madt(struct acpi_table_header *table)
412 acpi_madt = (struct acpi_table_madt *)table;
414 acpi_madt_rev = acpi_madt->header.revision;
416 /* remember the value for reference after free_initmem() */
417 #ifdef CONFIG_ITANIUM
418 has_8259 = 1; /* Firmware on old Itanium systems is broken */
420 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
422 iosapic_system_init(has_8259);
424 /* Get base address of IPI Message Block */
426 if (acpi_madt->address)
427 ipi_base_addr = ioremap(acpi_madt->address, 0);
429 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
431 acpi_madt_oem_check(acpi_madt->header.oem_id,
432 acpi_madt->header.oem_table_id);
437 #ifdef CONFIG_ACPI_NUMA
441 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
443 static int __initdata srat_num_cpus; /* number of cpus */
444 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
445 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
446 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
447 static struct acpi_table_slit __initdata *slit_table;
448 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
450 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
454 pxm = pa->proximity_domain_lo;
455 if (ia64_platform_is("sn2"))
456 pxm += pa->proximity_domain_hi[0] << 8;
460 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
464 pxm = ma->proximity_domain;
465 if (!ia64_platform_is("sn2"))
472 * ACPI 2.0 SLIT (System Locality Information Table)
473 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
475 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
479 len = sizeof(struct acpi_table_header) + 8
480 + slit->locality_count * slit->locality_count;
481 if (slit->header.length != len) {
483 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
484 len, slit->header.length);
491 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
495 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
498 pxm = get_processor_proximity_domain(pa);
500 /* record this node in proximity bitmap */
503 node_cpuid[srat_num_cpus].phys_id =
504 (pa->apic_id << 8) | (pa->local_sapic_eid);
505 /* nid should be overridden as logical node id later */
506 node_cpuid[srat_num_cpus].nid = pxm;
507 cpu_set(srat_num_cpus, early_cpu_possible_map);
512 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
514 unsigned long paddr, size;
516 struct node_memblk_s *p, *q, *pend;
518 pxm = get_memory_proximity_domain(ma);
520 /* fill node memory chunk structure */
521 paddr = ma->base_address;
524 /* Ignore disabled entries */
525 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
528 /* record this node in proximity bitmap */
531 /* Insertion sort based on base address */
532 pend = &node_memblk[num_node_memblks];
533 for (p = &node_memblk[0]; p < pend; p++) {
534 if (paddr < p->start_paddr)
538 for (q = pend - 1; q >= p; q--)
541 p->start_paddr = paddr;
547 void __init acpi_numa_arch_fixup(void)
549 int i, j, node_from, node_to;
551 /* If there's no SRAT, fix the phys_id and mark node 0 online */
552 if (srat_num_cpus == 0) {
554 node_cpuid[0].phys_id = hard_smp_processor_id();
559 * MCD - This can probably be dropped now. No need for pxm ID to node ID
560 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
562 nodes_clear(node_online_map);
563 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
564 if (pxm_bit_test(i)) {
565 int nid = acpi_map_pxm_to_node(i);
566 node_set_online(nid);
570 /* set logical node id in memory chunk structure */
571 for (i = 0; i < num_node_memblks; i++)
572 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
574 /* assign memory bank numbers for each chunk on each node */
575 for_each_online_node(i) {
579 for (j = 0; j < num_node_memblks; j++)
580 if (node_memblk[j].nid == i)
581 node_memblk[j].bank = bank++;
584 /* set logical node id in cpu structure */
585 for_each_possible_early_cpu(i)
586 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
588 printk(KERN_INFO "Number of logical nodes in system = %d\n",
590 printk(KERN_INFO "Number of memory chunks in system = %d\n",
594 for (i = 0; i < MAX_NUMNODES; i++)
595 for (j = 0; j < MAX_NUMNODES; j++)
596 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
601 memset(numa_slit, -1, sizeof(numa_slit));
602 for (i = 0; i < slit_table->locality_count; i++) {
603 if (!pxm_bit_test(i))
605 node_from = pxm_to_node(i);
606 for (j = 0; j < slit_table->locality_count; j++) {
607 if (!pxm_bit_test(j))
609 node_to = pxm_to_node(j);
610 node_distance(node_from, node_to) =
611 slit_table->entry[i * slit_table->locality_count + j];
616 printk("ACPI 2.0 SLIT locality table:\n");
617 for_each_online_node(i) {
618 for_each_online_node(j)
619 printk("%03d ", node_distance(i, j));
624 #endif /* CONFIG_ACPI_NUMA */
627 * success: return IRQ number (>=0)
628 * failure: return < 0
630 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
632 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
635 if (has_8259 && gsi < 16)
636 return isa_irq_to_vector(gsi);
638 return iosapic_register_intr(gsi,
640 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
643 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
647 void acpi_unregister_gsi(u32 gsi)
649 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
652 if (has_8259 && gsi < 16)
655 iosapic_unregister_intr(gsi);
658 static int __init acpi_parse_fadt(struct acpi_table_header *table)
660 struct acpi_table_header *fadt_header;
661 struct acpi_table_fadt *fadt;
666 fadt_header = (struct acpi_table_header *)table;
667 if (fadt_header->revision != 3)
668 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
670 fadt = (struct acpi_table_fadt *)fadt_header;
672 acpi_register_gsi(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
676 int __init acpi_boot_init(void)
682 * Parse the Multiple APIC Description Table (MADT), if exists.
683 * Note that this table provides platform SMP configuration
684 * information -- the successor to MPS tables.
687 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
688 printk(KERN_ERR PREFIX "Can't find MADT\n");
694 if (acpi_table_parse_madt
695 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
696 printk(KERN_ERR PREFIX
697 "Error parsing LAPIC address override entry\n");
699 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_lsapic, NR_CPUS)
701 printk(KERN_ERR PREFIX
702 "Error parsing MADT - no LAPIC entries\n");
704 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
706 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
710 if (acpi_table_parse_madt
711 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
712 if (!ia64_platform_is("sn2"))
713 printk(KERN_ERR PREFIX
714 "Error parsing MADT - no IOSAPIC entries\n");
717 /* System-Level Interrupt Routing */
719 if (acpi_table_parse_madt
720 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
721 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
722 printk(KERN_ERR PREFIX
723 "Error parsing platform interrupt source entry\n");
725 if (acpi_table_parse_madt
726 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
727 printk(KERN_ERR PREFIX
728 "Error parsing interrupt source overrides entry\n");
730 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
731 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
735 * FADT says whether a legacy keyboard controller is present.
736 * The FADT also contains an SCI_INT line, by which the system
737 * gets interrupts such as power and sleep buttons. If it's not
738 * on a Legacy interrupt, it needs to be setup.
740 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
741 printk(KERN_ERR PREFIX "Can't find FADT\n");
744 if (available_cpus == 0) {
745 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
746 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
747 smp_boot_data.cpu_phys_id[available_cpus] =
748 hard_smp_processor_id();
749 available_cpus = 1; /* We've got at least one of these, no? */
751 smp_boot_data.cpu_count = available_cpus;
754 # ifdef CONFIG_ACPI_NUMA
755 if (srat_num_cpus == 0) {
757 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
758 if (smp_boot_data.cpu_phys_id[cpu] !=
759 hard_smp_processor_id())
760 node_cpuid[i++].phys_id =
761 smp_boot_data.cpu_phys_id[cpu];
765 #ifdef CONFIG_ACPI_NUMA
766 build_cpu_to_node_map();
768 /* Make boot-up look pretty */
769 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
774 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
778 if (has_8259 && gsi < 16)
779 *irq = isa_irq_to_vector(gsi);
781 tmp = gsi_to_irq(gsi);
790 * ACPI based hotplug CPU support
792 #ifdef CONFIG_ACPI_HOTPLUG_CPU
794 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
796 #ifdef CONFIG_ACPI_NUMA
800 pxm_id = acpi_get_pxm(handle);
802 * We don't have cpu-only-node hotadd. But if the system equips
803 * SRAT table, pxm is already found and node is ready.
804 * So, just pxm_to_nid(pxm) is OK.
805 * This code here is for the system which doesn't have full SRAT
806 * table for possible cpus.
808 nid = acpi_map_pxm_to_node(pxm_id);
809 node_cpuid[cpu].phys_id = physid;
810 node_cpuid[cpu].nid = nid;
815 int additional_cpus __initdata = -1;
817 static __init int setup_additional_cpus(char *s)
820 additional_cpus = simple_strtol(s, NULL, 0);
825 early_param("additional_cpus", setup_additional_cpus);
828 * cpu_possible_map should be static, it cannot change as CPUs
829 * are onlined, or offlined. The reason is per-cpu data-structures
830 * are allocated by some modules at init time, and dont expect to
831 * do this dynamically on cpu arrival/departure.
832 * cpu_present_map on the other hand can change dynamically.
833 * In case when cpu_hotplug is not compiled, then we resort to current
834 * behaviour, which is cpu_possible == cpu_present.
837 * Three ways to find out the number of additional hotplug CPUs:
838 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
839 * - The user can overwrite it with additional_cpus=NUM
840 * - Otherwise don't reserve additional CPUs.
842 __init void prefill_possible_map(void)
845 int possible, disabled_cpus;
847 disabled_cpus = total_cpus - available_cpus;
849 if (additional_cpus == -1) {
850 if (disabled_cpus > 0)
851 additional_cpus = disabled_cpus;
856 possible = available_cpus + additional_cpus;
858 if (possible > NR_CPUS)
861 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
862 possible, max((possible - available_cpus), 0));
864 for (i = 0; i < possible; i++)
865 cpu_set(i, cpu_possible_map);
868 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
870 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
871 union acpi_object *obj;
872 struct acpi_madt_local_sapic *lsapic;
876 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
879 if (!buffer.length || !buffer.pointer)
882 obj = buffer.pointer;
883 if (obj->type != ACPI_TYPE_BUFFER)
885 kfree(buffer.pointer);
889 lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
891 if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
892 (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
893 kfree(buffer.pointer);
897 physid = ((lsapic->id << 8) | (lsapic->eid));
899 kfree(buffer.pointer);
900 buffer.length = ACPI_ALLOCATE_BUFFER;
901 buffer.pointer = NULL;
903 cpus_complement(tmp_map, cpu_present_map);
904 cpu = first_cpu(tmp_map);
908 acpi_map_cpu2node(handle, cpu, physid);
910 cpu_set(cpu, cpu_present_map);
911 ia64_cpu_to_sapicid[cpu] = physid;
917 EXPORT_SYMBOL(acpi_map_lsapic);
919 int acpi_unmap_lsapic(int cpu)
921 ia64_cpu_to_sapicid[cpu] = -1;
922 cpu_clear(cpu, cpu_present_map);
924 #ifdef CONFIG_ACPI_NUMA
925 /* NUMA specific cleanup's */
931 EXPORT_SYMBOL(acpi_unmap_lsapic);
932 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
934 #ifdef CONFIG_ACPI_NUMA
935 static acpi_status __devinit
936 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
938 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
939 union acpi_object *obj;
940 struct acpi_madt_io_sapic *iosapic;
941 unsigned int gsi_base;
944 /* Only care about objects w/ a method that returns the MADT */
945 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
948 if (!buffer.length || !buffer.pointer)
951 obj = buffer.pointer;
952 if (obj->type != ACPI_TYPE_BUFFER ||
953 obj->buffer.length < sizeof(*iosapic)) {
954 kfree(buffer.pointer);
958 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
960 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
961 kfree(buffer.pointer);
965 gsi_base = iosapic->global_irq_base;
967 kfree(buffer.pointer);
970 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
971 * us which node to associate this with.
973 pxm = acpi_get_pxm(handle);
977 node = pxm_to_node(pxm);
979 if (node >= MAX_NUMNODES || !node_online(node) ||
980 cpus_empty(node_to_cpumask(node)))
983 /* We know a gsi to node mapping! */
984 map_iosapic_to_node(gsi_base, node);
989 acpi_map_iosapics (void)
991 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
995 fs_initcall(acpi_map_iosapics);
996 #endif /* CONFIG_ACPI_NUMA */
998 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
1002 if ((err = iosapic_init(phys_addr, gsi_base)))
1005 #ifdef CONFIG_ACPI_NUMA
1006 acpi_map_iosapic(handle, 0, NULL, NULL);
1007 #endif /* CONFIG_ACPI_NUMA */
1012 EXPORT_SYMBOL(acpi_register_ioapic);
1014 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1016 return iosapic_remove(gsi_base);
1019 EXPORT_SYMBOL(acpi_unregister_ioapic);
1022 * acpi_save_state_mem() - save kernel state
1024 * TBD when when IA64 starts to support suspend...
1026 int acpi_save_state_mem(void) { return 0; }
1029 * acpi_restore_state()
1031 void acpi_restore_state_mem(void) {}
1034 * do_suspend_lowlevel()
1036 void do_suspend_lowlevel(void) {}
1038 #endif /* CONFIG_ACPI */